Thanks ScottyUK...good points. I had to look up PWM control and I see what you are talking about.
In response to your Thermal Time Constant question, I had to think a little.
Our Temp Controllers are
At power up the power in on constantly until setpoint is reached. Actually it over shoots...
Thanks for all the help. I work for a heater manufacturer in the IT department. Lately I've been learning PLCs, prox sensors and now relays and current sensors. We are testing new products life. It should be >4000 hours.
I ended up going with an NK current switch. It does have a delay...
Thanks for the quick response. I had looked at the current sensors, but was worried about response time. At temp the heater turns on an off about 3 times per second. Would a current sensor be quick enough. I will also start looking at specs on the sensors.
Thanks again for the help.
I have a background in computer electronics and currently working as a network engineer. I have very little experience with relays. I have been tasked with building a timer circuit for testing heaters. Should have been simple, but has proved to be a bit of a challenge. I need to trigger a...
